AudioCodes MediaPack 114 Bedienungsanleitung PDF herunterladen (Seite 367)

Version 5.6 367 November 2008

SIP User's Manual 8. Networking Capabilities

To enable STUN, perform the following:

 Enable the STUN feature using either the Web interface (refer to ''Configuring the

Application Settings'' on page 58) o

r the ini file (set EnableSTUN to 1).

 Define the STUN server address using one of the following methods:

• Define the IP address of the primary and the secondary (optional) STUN servers

using either the Web interface (refer to ''Configuring the Application Settings'' on

page 58) o

r the ini file (STUNServerPrimaryIP and STUNServerSecondaryIP). If

the primary STUN server isn’t available, the device attempts to communicate with

the secondary server.

• Define the domain name of the STUN server using the ini file parameter

StunServerDomainName. The STUN client retrieves all STUN servers with an

SRV query to resolve this domain name to an IP address and port, sort the server

list, and use the servers according to the sorted list.

 Use the ini file parameter NATBindingDefaultTimeout to define the default NAT binding

lifetime in seconds. STUN is used to refresh the binding information after this time

expires.

Notes:

• STUN only applies to UDP (doesn’t support TCP and TLS).

• STUN can’t be used when the device is located behind a symmetric NAT.

• Use either the STUN server IP address (STUNServerPrimaryIP) or

domain name (STUNServerDomainName) method, with priority to the

first one.

8.2.2 First Incoming Packet Mechanism

If the remote device resides behind a NAT device, it’s possible that the device can activate

the RTP/RTCP/T.38 streams to an invalid IP address / UDP port. To avoid such cases, the

device automatically compares the source address of the incoming RTP/RTCP/T.38 stream

with the IP address and UDP port of the remote device. If the two are not identical, the

transmitter modifies the sending address to correspond with the address of the incoming

stream. The RTP, RTCP and T.38 can thus have independent destination IP addresses and

UDP ports.

You can disable the NAT mechanism by setting the ini file parameter DisableNAT to 1. The

two parameters EnableIpAddrTranslation and EnableUdpPortTranslation allow you to

specify the type of compare operation that occurs on the first incoming packet. To compare

only the IP address, set EnableIpAddrTranslation to 1, and EnableUdpPortTranslation to 0.

In this case, if the first incoming packet arrives with only a difference in the UDP port, the

sending addresses won’t change. If both the IP address and UDP port need to be

compared, then both parameters need to be set to 1.

8.2.3 No-Op Packets

The device's No-Op packet support can be used to verify Real-Time Transport Protocol

(RTP) and T.38 connectivity, and to keep NAT bindings and Firewall pinholes open. The

No-Op packets are available for sending in RTP and T.38 formats.

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